The story centers around Kio Kakazu, a high school freshman living in Okinawa. During a memorial service for one of his family ancestors, a mysterious girl with cat ears appears before him introducing herself as an alien called Eris, bringing troubles with her.

\tHaruka Tomatsuas Manami Kinjō
Kana Hanazawa as Aoi Futaba
Kanae Itō as Erisu
Mutsumi Tamura as Kio Kakazu

Aki Toyosaki as Melwin
Hiromi Hirata as Maki Itokazu
Iori Nomizu as Antonia
Kikuko Inoue as Kuune
Minako Kotobuki as Chaika
Yui Horie as Jens
Yukiko Monden as Jack

Akeno Watanabe as Sara
Ayahi Takagaki as Narrator
Sayori Ishizuka as Maya